Budolf tanczos



ilnrrnn I STATES PATENT Trio a,

RUDOLF TANCZOS, on IENNA, AUSTRIA-HUNGARY.

FlREPROOFlNG' WOOD.

SPECIFICATION forming part of Letters Patent No. 329,973, dated November 1Q, 1885.

Application filed August 13, 1885. Serial No. 174,331. (No specimens.) Patented in Belgium July 4, 1885,N0. G9,491, and in Italy August 5, 1885, 3:11;, 18,626, and XXXVII, .19.

.To all whom it may concern):

Be it known that I, RUDoLF Trixozos, a subject of the Emperor of Austria-Hungary, residing at Vienna, in the Province of Lower Austria,in the Empire of Austria-Hungary, have invented certain new and useful Improvements in Fireproof Impregnating 'Matcrial; and I do hereby declare the follow- I ingto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This'invention relates to a process of rendering wood or like fibrous substances incomhustible; and in earrying'out this processlproceed as follows: About four parts, by weight, of borax, (biborate of soda,) and about three parts, by weight, Qt bittersalt (sulphate of magnesia) are dissolved in about twenty parts of hot water, and in the solution thus prepared the wood or like substance, which has been thoroughly dried, is immersed for a sufficient length of time to enable the wood to be thoroughly impregnated with the solution. The impregnated wood is then removed from the solution, and is coated with a mixture of washed clay and a sulficieut quantity of liquid water-glass by preference soda waterglass) to enable the mass to be applied by means of a brush. The wood, after being allowed to dr'y,is enveloped ina paper or wovenfabric sheath. If a woven fabric is used, I prefer to use acoarselinen'fabric. The paper or fabric before being placed around the wood is impregnated with thesolution of borax and bitter'salt, heretofore mentioned.

As a final step of the process, the impregnated wood and its like sheathing is coated with a mixtui e of from thirty to forty parts, by weight, of sulphateof ammonia, and from thirty-five to forty-five parts, by weight, of

gypsum (hydrated sulphate of lime) diluted with asuffieientquantity of water to allow of the mass being conveniently applied.

When treated in the described manner, the" wood is particularly adapted for use as afilling for safes, and for other purposes where a fire-proof material is required or desirable.

. \Vhat I claim is The herein-described process of rendering wood or other like fibrous substances incom bustible, which consists in impregnating the dried material with a warm aqueous solution of borax and bitter salt, (n'mgnesium sulphate,) drying the same, coating the same with a mixture'of washed clay and waterglass, after which the material is sheathed with paper or a woven fabric previously impregnated with the describedsolution of borax and bitter-salt, and then applying to the sheathed material a solution of sulphate of ammonia", gypsum, and water.

In testimony whercoil affix my signature in presence of twowitnesses. I

y 7 RUDOLF TANOZOS'. Witnesses:

ADOLF TIscuLnn, SAMUEL Wnn'rnnm, J r 

